OSDI '04 Abstract
Pp. 379394 of the Proceedings
Life or Death at Block-Level
Muthian Sivathanu, Lakshmi N. Bairavasundaram, Andrea C. Arpaci-Dusseau, and Remzi H. Arpaci-Dusseau, University of Wisconsin, Madison
A fundamental piece of information required in intelligent storage
systems is the liveness of data. We formalize the notion of
liveness within storage, and present two classes of techniques for
making storage systems liveness-aware. In the explicit notification
approach, we present robust techniques by which a file system
can impart liveness information to storage through a "free
block" command. In the implicit detection approach, we show
that such information can be inferred by the storage system efficiently underneath a range of file systems, without changes to
the storage interface. We demonstrate our techniques through
a prototype implementation of a secure deleting disk. We find
that while the explicit interface approach is desirable due to its
simplicity, the implicit approach is easy to deploy and enables
quick demonstration of new functionality, thus facilitating rapid
migration to an explicit interface.
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